Datasheet

© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSA1256(A) / FSA1257(A) / FSA1258(A) Rev. 1.0.9 8
FSA1256(A) / FSA1257(A) / FSA1258(A) — Low-R
ON
Low-Voltage, Dual SPST Analog Switch with Low-I
CCT
Test Diagrams (Continued)
R
S
and R
T
are functions of the application
environment (50, 75, or 100 ).
V
OUT
GND
GND
R
T
GND
GND
V
S
R
S
Network Analyzer
R
T
GND
V
Sel
GND
Crosstalk = 20 Log (V
OUT
/ V
IN
)
V
IN
Figure 12. Adjacent Channel Crosstalk
R
S
V
OUT
Q = ∆V
OUT
• C
L
∆V
OUT
V
OUT
V
CC
0V
Input – V
SEL
Generator
GND
V
S
C
L
V
SEL
V
IN
B
nS
n
GND
C
L
includes test fixture and stray capacitance
GND
Off On Off
mA
Figure 13. Charge Injection Test
B0
n
B1
Capacitance
Meter
Select
B0,B1
f=1MHz
V
S
= 0 or V
CC
nB
n
Capacitance
Meter
Select
f=1MHz
V
S
= 0 or V
CC
nB
n
Figure 14. Channel Off Capacitance Figure 15. Channel On Capacitance
V
OUT
GND
GND
R
T
GND
GND
V
S
R
S
Audio Analyzer
V
CNTRL
GND
V
IN
V
CNTRL
= 0 or Vcc
R
S
and R
T
are functions of the
application environment.
Figure 16. Total Harmonic Distortion